PHP | hash_update_file() Function

PHP hash_update_file() Function


Hello dear readers! welcome back to another edition of our tutorial on PHP. In this tutorial guide, we are going to be discussing about the PHP hash_update_file() Function.

The built-in PHP hash_update_file() function updates the given file content with the hash context.

Syntax

Following below is the syntax to use this function -

hash_update_file ( HashContext $hcontext , string $filename [, resource $scontext = NULL ] ) : bool


Parameter Details

Sr.NoParameter & Description
1

HashContext context

The hash context that you get using hash_init().

2

filename

The file path, to get the content to be hashed.

3

scontext

Stream context as returned by stream_context_create().


Return Value

This built-in PHP functions returns true or false.

PHP Version

This built-in function works from PHP version greater than 5.1.2.

Example1

Following example illustrates the use of the PHP hash_update_file() function -

<?php
   $hash_context = hash_init('md5');
   file_put_contents('file1.txt', 'Hello World'); 
   // create file file1.txt with content : 'Hello World'
   hash_update_file($hash_context, 'file1.txt');
   echo hash_final($hash_context);
?>

Output

When the above code is executed, it will produce the following result -

b10a8db164e0754105b7a99be72e3fe5

Example2
Following example illustrates the use of the PHP hash_update_file() function with the gost-crypto algo -

<?php
   $hash_context = hash_init('gost-crypto');
   file_put_contents('file1.txt', 'Hello World'); 
   // create file file1.txt with content : 'Hello World'
   hash_update_file($hash_context, 'file1.txt');
   echo hash_final($hash_context);
?>

Output
When the above code is executed, it will produce the following result -

75ed15d84df84291c67fe07bf234ac69e92a9c2a378ee62f342af739e829eba9


Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial, we will discuss about the hash_update_stream() Function in PHP.

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